The NASA e-book titled Archaeology, Anthroology, and Interstellar Communication, which was issued earlier this week, details efforts in the hunt for extraterrestrial life. It has since been taken down without explanation.

But many insist it contained a real eye-opener.

The 330 page book, edited by the director of Interstellar Message Composition at SETI (Search for Extraterrestrial Intelligence), Dr Douglas Vakoch, allegedly made the extraordinary suggestion that unusual ancient patterns gouged into rocks “might have been made by aliens”.

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